If you have access to a frequency counter or an oscilloscope I would next check the 3 clock signals coming from the Raduino to the uBitx board.?
If you measure approximately 45 MHz- dial setting in Mhz on clock#2, approximately 56 or 34 Mhz on clock#1 and the BFO frequency (11.0555 MHz on my rig) on clock#0, then the Raduino is good.? This can be checked with the Raduino removed from the rig and powered by a micro or mini USB cable depending on? the plug on the Nano in the Raduino.? You do need the display connected to the Raduino so you know what the frequency is.? You should connect the digital control connector as well.? Then measure the clock signals on the pins that would plug into the uBitx main board.
If the Raduino checks outs, then you will need to start doing static voltage tests on the active devices in the rig.
4 main differences between the v3 and the v5 uBitx
1 - First IF after the first mixer transistors were changed, so the static readings for that stage may be different
2 - The SSB crystal frequency was changed from 12 MHz to 11.059 MHz? This means the clock 2 and clock 0 frequences will be different
3 - The audio section was based on a different audio IC than the LM386
4 - The output LPF scheme was changed.
The last change would not affect the receiver.
I believe that there were other changes to improve key click and receiver audio muting.
Above are just suggestions.? I have both v4 and v5 boards, though not v3.
73
Evan
AC9TU
